Feature Tip: Add private address tag to any address under My Name Tag !
ERC-721
Overview
Max Total Supply
105 LAMBO
Holders
105
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 LAMBOLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
BitizenCarToken
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-08-31 */ pragma solidity ^0.4.24; interface ERC165 { /** * @notice Query if a contract implements an interface * @param _interfaceId The interface identifier, as specified in ERC-165 * @dev Interface identification is specified in ERC-165. This function * uses less than 30,000 gas. */ function supportsInterface(bytes4 _interfaceId) external view returns (bool); } interface ERC721 /* is ERC165 */ { /// @dev This emits when ownership of any NFT changes by any mechanism. /// This event emits when NFTs are created (`from` == 0) and destroyed /// (`to` == 0). Exception: during contract creation, any number of NFTs /// may be created and assigned without emitting Transfer. At the time of /// any transfer, the approved address for that NFT (if any) is reset to none. event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId); /// @dev This emits when the approved address for an NFT is changed or /// reaffirmed. The zero address indicates there is no approved address. /// When a Transfer event emits, this also indicates that the approved /// address for that NFT (if any) is reset to none. event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId); /// @dev This emits when an operator is enabled or disabled for an owner. /// The operator can manage all NFTs of the owner. event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); /// @notice Count all NFTs assigned to an owner /// @dev NFTs assigned to the zero address are considered invalid, and this /// function throws for queries about the zero address. /// @param _owner An address for whom to query the balance /// @return The number of NFTs owned by `_owner`, possibly zero function balanceOf(address _owner) external view returns (uint256); /// @notice Find the owner of an NFT /// @dev NFTs assigned to zero address are considered invalid, and queries /// about them do throw. /// @param _tokenId The identifier for an NFT /// @return The address of the owner of the NFT function ownerOf(uint256 _tokenId) external view returns (address); /// @notice Transfers the ownership of an NFT from one address to another address /// @dev Throws unless `msg.sender` is the current owner, an authorized /// operator, or the approved address for this NFT. Throws if `_from` is /// not the current owner. Throws if `_to` is the zero address. Throws if /// `_tokenId` is not a valid NFT. When transfer is complete, this function /// checks if `_to` is a smart contract (code size > 0). If so, it calls /// `onERC721Received` on `_to` and throws if the return value is not /// `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`. /// @param _from The current owner of the NFT /// @param _to The new owner /// @param _tokenId The NFT to transfer /// @param data Additional data with no specified format, sent in call to `_to` function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external; /// @notice Transfers the ownership of an NFT from one address to another address /// @dev This works identically to the other function with an extra data parameter, /// except this function just sets data to "". /// @param _from The current owner of the NFT /// @param _to The new owner /// @param _tokenId The NFT to transfer function safeTransferFrom(address _from, address _to, uint256 _tokenId) external; /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE /// TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE /// THEY MAY BE PERMANENTLY LOST /// @dev Throws unless `msg.sender` is the current owner, an authorized /// operator, or the approved address for this NFT. Throws if `_from` is /// not the current owner. Throws if `_to` is the zero address. Throws if /// `_tokenId` is not a valid NFT. /// @param _from The current owner of the NFT /// @param _to The new owner /// @param _tokenId The NFT to transfer function transferFrom(address _from, address _to, uint256 _tokenId) external; /// @notice Change or reaffirm the approved address for an NFT /// @dev The zero address indicates there is no approved address. /// Throws unless `msg.sender` is the current NFT owner, or an authorized /// operator of the current owner. /// @param _approved The new approved NFT controller /// @param _tokenId The NFT to approve function approve(address _approved, uint256 _tokenId) external; /// @notice Enable or disable approval for a third party ("operator") to manage /// all of `msg.sender`'s assets /// @dev Emits the ApprovalForAll event. The contract MUST allow /// multiple operators per owner. /// @param _operator Address to add to the set of authorized operators /// @param _approved True if the operator is approved, false to revoke approval function setApprovalForAll(address _operator, bool _approved) external; /// @notice Get the approved address for a single NFT /// @dev Throws if `_tokenId` is not a valid NFT. /// @param _tokenId The NFT to find the approved address for /// @return The approved address for this NFT, or the zero address if there is none function getApproved(uint256 _tokenId) external view returns (address); /// @notice Query if an address is an authorized operator for another address /// @param _owner The address that owns the NFTs /// @param _operator The address that acts on behalf of the owner /// @return True if `_operator` is an approved operator for `_owner`, false otherwise function isApprovedForAll(address _owner, address _operator) external view returns (bool); } /// Note: the ERC-165 identifier for this interface is 0x780e9d63. interface ERC721Enumerable /* is ERC721 */ { /// @notice Count NFTs tracked by this contract /// @return A count of valid NFTs tracked by this contract, where each one of /// them has an assigned and queryable owner not equal to the zero address function totalSupply() external view returns (uint256); /// @notice Enumerate valid NFTs /// @dev Throws if `_index` >= `totalSupply()`. /// @param _index A counter less than `totalSupply()` /// @return The token identifier for the `_index`th NFT, /// (sort order not specified) function tokenByIndex(uint256 _index) external view returns (uint256); /// @notice Enumerate NFTs assigned to an owner /// @dev Throws if `_index` >= `balanceOf(_owner)` or if /// `_owner` is the zero address, representing invalid NFTs. /// @param _owner An address where we are interested in NFTs owned by them /// @param _index A counter less than `balanceOf(_owner)` /// @return The token identifier for the `_index`th NFT assigned to `_owner`, /// (sort order not specified) function tokenOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256); } /// Note: the ERC-165 identifier for this interface is 0x5b5e139f. interface ERC721Metadata /* is ERC721 */ { /// @notice A descriptive name for a collection of NFTs in this contract function name() external view returns (string _name); /// @notice An abbreviated name for NFTs in this contract function symbol() external view returns (string _symbol); /// @notice A distinct Uniform Resource Identifier (URI) for a given asset. /// @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC /// 3986. The URI may point to a JSON file that conforms to the "ERC721 /// Metadata JSON Schema". function tokenURI(uint256 _tokenId) external view returns (string); } /// @dev Note: the ERC-165 identifier for this interface is 0x150b7a02. interface ERC721TokenReceiver { /// @notice Handle the receipt of an NFT /// @dev The ERC721 smart contract calls this function on the recipient /// after a `transfer`. This function MAY throw to revert and reject the /// transfer. Return of other than the magic value MUST result in the /// transaction being reverted. /// Note: the contract address is always the message sender. /// @param _operator The address which called `safeTransferFrom` function /// @param _from The address which previously owned the token /// @param _tokenId The NFT identifier which is being transferred /// @param _data Additional data with no specified format /// @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` /// unless throwing function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes _data) external returns(bytes4); } /** * @title SupportsInterfaceWithLookup * @author Matt Condon (@shrugs) * @dev Implements ERC165 using a lookup table. */ contract SupportsInterfaceWithLookup is ERC165 { bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7; /** * 0x01ffc9a7 === * bytes4(keccak256('supportsInterface(bytes4)')) */ /** * @dev a mapping of interface id to whether or not it's supported */ mapping(bytes4 => bool) internal supportedInterfaces; /** * @dev A contract implementing SupportsInterfaceWithLookup * implement ERC165 itself */ constructor() public { _registerInterface(InterfaceId_ERC165); } /** * @dev implement supportsInterface(bytes4) using a lookup table */ function supportsInterface(bytes4 _interfaceId) external view returns (bool) { return supportedInterfaces[_interfaceId]; } /** * @dev private method for registering an interface */ function _registerInterface(bytes4 _interfaceId) internal { require(_interfaceId != 0xffffffff); supportedInterfaces[_interfaceId] = true; } } /** * Utility library of inline functions on addresses */ library AddressUtils { /** * Returns whether the target address is a contract * @dev This function will return false if invoked during the constructor of a contract, * as the code is not actually created until after the constructor finishes. * @param addr address to check * @return whether the target address is a contract */ function isContract(address addr) internal view returns (bool) { uint256 size; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 // for more details about how this works. // TODO Check this again before the Serenity release, because all addresses will be // contracts then. // solium-disable-next-line security/no-inline-assembly assembly { size := extcodesize(addr) } return size > 0; } } library UrlStr { // generate url by tokenId // baseUrl must end with 00000000 function generateUrl(string url,uint256 _tokenId) internal pure returns (string _url){ _url = url; bytes memory _tokenURIBytes = bytes(_url); uint256 base_len = _tokenURIBytes.length - 1; _tokenURIBytes[base_len - 7] = byte(48 + _tokenId / 10000000 % 10); _tokenURIBytes[base_len - 6] = byte(48 + _tokenId / 1000000 % 10); _tokenURIBytes[base_len - 5] = byte(48 + _tokenId / 100000 % 10); _tokenURIBytes[base_len - 4] = byte(48 + _tokenId / 10000 % 10); _tokenURIBytes[base_len - 3] = byte(48 + _tokenId / 1000 % 10); _tokenURIBytes[base_len - 2] = byte(48 + _tokenId / 100 % 10); _tokenURIBytes[base_len - 1] = byte(48 + _tokenId / 10 % 10); _tokenURIBytes[base_len - 0] = byte(48 + _tokenId / 1 % 10); } } /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } /** * @dev Integer division of two numbers, truncating the quotient. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } /** * @dev Adds two numbers, throws on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; event OwnershipRenounced(address indexed previousOwner); event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ constructor() public { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to relinquish control of the contract. * @notice Renouncing to ownership will leave the contract without an owner. * It will not be possible to call the functions with the `onlyOwner` * modifier anymore. */ function renounceOwnership() public onlyOwner { emit OwnershipRenounced(owner); owner = address(0); } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param _newOwner The address to transfer ownership to. */ function transferOwnership(address _newOwner) public onlyOwner { _transferOwnership(_newOwner); } /** * @dev Transfers control of the contract to a newOwner. * @param _newOwner The address to transfer ownership to. */ function _transferOwnership(address _newOwner) internal { require(_newOwner != address(0)); emit OwnershipTransferred(owner, _newOwner); owner = _newOwner; } } /** * @title Operator * @dev Allow two roles: 'owner' or 'operator' * - owner: admin/superuser (e.g. with financial rights) * - operator: can update configurations */ contract Operator is Ownable { address[] public operators; uint public MAX_OPS = 20; // Default maximum number of operators allowed mapping(address => bool) public isOperator; event OperatorAdded(address operator); event OperatorRemoved(address operator); // @dev Throws if called by any non-operator account. Owner has all ops rights. modifier onlyOperator() { require( isOperator[msg.sender] || msg.sender == owner, "Permission denied. Must be an operator or the owner." ); _; } /** * @dev Allows the current owner or operators to add operators * @param _newOperator New operator address */ function addOperator(address _newOperator) public onlyOwner { require( _newOperator != address(0), "Invalid new operator address." ); // Make sure no dups require( !isOperator[_newOperator], "New operator exists." ); // Only allow so many ops require( operators.length < MAX_OPS, "Overflow." ); operators.push(_newOperator); isOperator[_newOperator] = true; emit OperatorAdded(_newOperator); } /** * @dev Allows the current owner or operators to remove operator * @param _operator Address of the operator to be removed */ function removeOperator(address _operator) public onlyOwner { // Make sure operators array is not empty require( operators.length > 0, "No operator." ); // Make sure the operator exists require( isOperator[_operator], "Not an operator." ); // Manual array manipulation: // - replace the _operator with last operator in array // - remove the last item from array address lastOperator = operators[operators.length - 1]; for (uint i = 0; i < operators.length; i++) { if (operators[i] == _operator) { operators[i] = lastOperator; } } operators.length -= 1; // remove the last element isOperator[_operator] = false; emit OperatorRemoved(_operator); } // @dev Remove ALL operators function removeAllOps() public onlyOwner { for (uint i = 0; i < operators.length; i++) { isOperator[operators[i]] = false; } operators.length = 0; } } contract Pausable is Operator { event FrozenFunds(address target, bool frozen); bool public isPaused = false; mapping(address => bool) frozenAccount; modifier whenNotPaused { require(!isPaused); _; } modifier whenPaused { require(isPaused); _; } modifier whenNotFreeze(address _target) { require(_target != address(0)); require(!frozenAccount[_target]); _; } function isFrozen(address _target) external view returns (bool) { require(_target != address(0)); return frozenAccount[_target]; } function doPause() external whenNotPaused onlyOwner { isPaused = true; } function doUnpause() external whenPaused onlyOwner { isPaused = false; } function freezeAccount(address _target, bool _freeze) public onlyOwner { require(_target != address(0)); frozenAccount[_target] = _freeze; emit FrozenFunds(_target, _freeze); } } contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721, Pausable{ bytes4 public constant InterfaceId_ERC721 = 0x80ac58cd; /* * 0x80ac58cd === * bytes4(keccak256('balanceOf(address)')) ^ * bytes4(keccak256('ownerOf(uint256)')) ^ * bytes4(keccak256('approve(address,uint256)')) ^ * bytes4(keccak256('getApproved(uint256)')) ^ * bytes4(keccak256('setApprovalForAll(address,bool)')) ^ * bytes4(keccak256('isApprovedForAll(address,address)')) ^ * bytes4(keccak256('transferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) */ bytes4 public constant InterfaceId_ERC721Exists = 0x4f558e79; /* * 0x4f558e79 === * bytes4(keccak256('exists(uint256)')) */ using SafeMath for uint256; using AddressUtils for address; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` bytes4 public constant ERC721_RECEIVED = 0x150b7a02; // Mapping from token ID to owner mapping (uint256 => address) internal tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) internal tokenApprovals; // Mapping from owner to number of owned token mapping (address => uint256) internal ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) internal operatorApprovals; /** * @dev Guarantees msg.sender is owner of the given token * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender */ modifier onlyOwnerOf(uint256 _tokenId) { require(_ownerOf(_tokenId) == msg.sender,"This token not owned by this address"); _; } function _ownerOf(uint256 _tokenId) internal view returns(address) { address _owner = tokenOwner[_tokenId]; require(_owner != address(0),"Token not exist"); return _owner; } /** * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator * @param _tokenId uint256 ID of the token to validate */ modifier canTransfer(uint256 _tokenId) { require(isApprovedOrOwner(msg.sender, _tokenId), "This address have no permisstion"); _; } constructor() public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721); _registerInterface(InterfaceId_ERC721Exists); _registerInterface(ERC721_RECEIVED); } /** * @dev Gets the balance of the specified address * @param _owner address to query the balance of * @return uint256 representing the amount owned by the passed address */ function balanceOf(address _owner) external view returns (uint256) { require(_owner != address(0)); return ownedTokensCount[_owner]; } /** * @dev Gets the owner of the specified token ID * @param _tokenId uint256 ID of the token to query the owner of * @return owner address currently marked as the owner of the given token ID */ function ownerOf(uint256 _tokenId) external view returns (address) { return _ownerOf(_tokenId); } /** * @dev Returns whether the specified token exists * @param _tokenId uint256 ID of the token to query the existence of * @return whether the token exists */ function exists(uint256 _tokenId) internal view returns (bool) { address owner = tokenOwner[_tokenId]; return owner != address(0); } /** * @dev Approves another address to transfer the given token ID * The zero address indicates there is no approved address. * There can only be one approved address per token at a given time. * Can only be called by the token owner or an approved operator. * @param _to address to be approved for the given token ID * @param _tokenId uint256 ID of the token to be approved */ function approve(address _to, uint256 _tokenId) external whenNotPaused { address _owner = _ownerOf(_tokenId); require(_to != _owner); require(msg.sender == _owner || operatorApprovals[_owner][msg.sender]); tokenApprovals[_tokenId] = _to; emit Approval(_owner, _to, _tokenId); } /** * @dev Gets the approved address for a token ID, or zero if no address set * @param _tokenId uint256 ID of the token to query the approval of * @return address currently approved for the given token ID */ function getApproved(uint256 _tokenId) external view returns (address) { return tokenApprovals[_tokenId]; } /** * @dev Sets or unsets the approval of a given operator * An operator is allowed to transfer all tokens of the sender on their behalf * @param _to operator address to set the approval * @param _approved representing the status of the approval to be set */ function setApprovalForAll(address _to, bool _approved) external whenNotPaused { require(_to != msg.sender); operatorApprovals[msg.sender][_to] = _approved; emit ApprovalForAll(msg.sender, _to, _approved); } /** * @dev Tells whether an operator is approved by a given owner * @param _owner owner address which you want to query the approval of * @param _operator operator address which you want to query the approval of * @return bool whether the given operator is approved by the given owner */ function isApprovedForAll( address _owner, address _operator ) external view returns (bool) { return operatorApprovals[_owner][_operator]; } /** * @dev Transfers the ownership of a given token ID to another address * Usage of this method is discouraged, use `safeTransferFrom` whenever possible * Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred */ function transferFrom( address _from, address _to, uint256 _tokenId ) external canTransfer(_tokenId) { _transfer(_from,_to,_tokenId); } function _transfer( address _from, address _to, uint256 _tokenId) internal { require(_from != address(0)); require(_to != address(0)); clearApproval(_from, _tokenId); removeTokenFrom(_from, _tokenId); addTokenTo(_to, _tokenId); emit Transfer(_from, _to, _tokenId); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * * Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred */ function safeTransferFrom( address _from, address _to, uint256 _tokenId ) external canTransfer(_tokenId) { // solium-disable-next-line arg-overflow _safeTransferFrom(_from, _to, _tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function _safeTransferFrom( address _from, address _to, uint256 _tokenId, bytes _data) internal { _transfer(_from, _to, _tokenId); // solium-disable-next-line arg-overflow require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data)); } function safeTransferFrom( address _from, address _to, uint256 _tokenId, bytes _data ) external canTransfer(_tokenId) { _safeTransferFrom(_from, _to, _tokenId, _data); } /** * @dev Returns whether the given spender can transfer a given token ID * @param _spender address of the spender to query * @param _tokenId uint256 ID of the token to be transferred * @return bool whether the msg.sender is approved for the given token ID, * is an operator of the owner, or is the owner of the token */ function isApprovedOrOwner ( address _spender, uint256 _tokenId ) internal view returns (bool) { address _owner = _ownerOf(_tokenId); // Disable solium check because of // https://github.com/duaraghav8/Solium/issues/175 // solium-disable-next-line operator-whitespace return ( _spender == _owner || tokenApprovals[_tokenId] == _spender || operatorApprovals[_owner][_spender] ); } /** * @dev Internal function to mint a new token * Reverts if the given token ID already exists * @param _to The address that will own the minted token * @param _tokenId uint256 ID of the token to be minted by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { require(_to != address(0)); addTokenTo(_to, _tokenId); emit Transfer(address(0), _to, _tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @param _tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address _owner, uint256 _tokenId) internal { clearApproval(_owner, _tokenId); removeTokenFrom(_owner, _tokenId); emit Transfer(_owner, address(0), _tokenId); } /** * @dev Internal function to clear current approval of a given token ID * Reverts if the given address is not indeed the owner of the token * @param _owner owner of the token * @param _tokenId uint256 ID of the token to be transferred */ function clearApproval(address _owner, uint256 _tokenId) internal whenNotPaused { require(_ownerOf(_tokenId) == _owner); if (tokenApprovals[_tokenId] != address(0)) { tokenApprovals[_tokenId] = address(0); } } /** * @dev Internal function to add a token ID to the list of a given address * @param _to address representing the new owner of the given token ID * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address */ function addTokenTo(address _to, uint256 _tokenId) internal whenNotPaused { require(tokenOwner[_tokenId] == address(0)); require(!frozenAccount[_to]); tokenOwner[_tokenId] = _to; ownedTokensCount[_to] = ownedTokensCount[_to].add(1); } /** * @dev Internal function to remove a token ID from the list of a given address * @param _from address representing the previous owner of the given token ID * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function removeTokenFrom(address _from, uint256 _tokenId) internal whenNotPaused { require(_ownerOf(_tokenId) == _from); require(!frozenAccount[_from]); ownedTokensCount[_from] = ownedTokensCount[_from].sub(1); tokenOwner[_tokenId] = address(0); } /** * @dev Internal function to invoke `onERC721Received` on a target address * The call is not executed if the target address is not a contract * @param _from address representing the previous owner of the given token ID * @param _to target address that will receive the tokens * @param _tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return whether the call correctly returned the expected magic value */ function checkAndCallSafeTransfer( address _from, address _to, uint256 _tokenId, bytes _data ) internal returns (bool) { if (!_to.isContract()) { return true; } bytes4 retval = ERC721TokenReceiver(_to).onERC721Received( msg.sender, _from, _tokenId, _data); return (retval == ERC721_RECEIVED); } } contract ERC721ExtendToken is ERC721BasicToken, ERC721Enumerable, ERC721Metadata { using UrlStr for string; bytes4 public constant InterfaceId_ERC721Enumerable = 0x780e9d63; /** * 0x780e9d63 === * bytes4(keccak256('totalSupply()')) ^ * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^ * bytes4(keccak256('tokenByIndex(uint256)')) */ bytes4 public constant InterfaceId_ERC721Metadata = 0x5b5e139f; /** * 0x5b5e139f === * bytes4(keccak256('name()')) ^ * bytes4(keccak256('symbol()')) ^ * bytes4(keccak256('tokenURI(uint256)')) */ string internal BASE_URL = "https://www.bitguild.com/bitizens/api/lambo/getCarInfo/00000000"; // Mapping from owner to list of owned token IDs mapping(address => uint256[]) internal ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) internal ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] internal allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) internal allTokensIndex; function updateBaseURI(string _url) external onlyOwner { BASE_URL = _url; } /** * @dev Constructor function */ constructor() public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721Enumerable); _registerInterface(InterfaceId_ERC721Metadata); } /** * @dev Gets the token name * @return string representing the token name */ function name() external view returns (string) { return "Bitizen Lambo"; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() external view returns (string) { return "LAMBO"; } /** * @dev Returns an URI for a given token ID * Throws if the token ID does not exist. May return an empty string. * @param _tokenId uint256 ID of the token to query */ function tokenURI(uint256 _tokenId) external view returns (string) { require(exists(_tokenId)); return BASE_URL.generateUrl(_tokenId); } /** * @dev Gets the token ID at a given index of the tokens list of the requested owner * @param _owner address owning the tokens list to be accessed * @param _index uint256 representing the index to be accessed of the requested tokens list * @return uint256 token ID at the given index of the tokens list owned by the requested address */ function tokenOfOwnerByIndex( address _owner, uint256 _index ) public view returns (uint256) { require(address(0)!=_owner); require(_index < ownedTokensCount[_owner]); return ownedTokens[_owner][_index]; } /** * @dev Gets the total amount of tokens stored by the contract * @return uint256 representing the total amount of tokens */ function totalSupply() public view returns (uint256) { return allTokens.length; } /** * @dev Gets the token ID at a given index of all the tokens in this contract * Reverts if the index is greater or equal to the total number of tokens * @param _index uint256 representing the index to be accessed of the tokens list * @return uint256 token ID at the given index of the tokens list */ function tokenByIndex(uint256 _index) public view returns (uint256) { require(_index < totalSupply()); return allTokens[_index]; } /** * @dev Internal function to add a token ID to the list of a given address * @param _to address representing the new owner of the given token ID * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address */ function addTokenTo(address _to, uint256 _tokenId) internal whenNotPaused { super.addTokenTo(_to, _tokenId); uint256 length = ownedTokens[_to].length; ownedTokens[_to].push(_tokenId); ownedTokensIndex[_tokenId] = length; } /** * @dev Internal function to remove a token ID from the list of a given address * @param _from address representing the previous owner of the given token ID * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function removeTokenFrom(address _from, uint256 _tokenId) internal whenNotPaused { super.removeTokenFrom(_from, _tokenId); uint256 tokenIndex = ownedTokensIndex[_tokenId]; uint256 lastTokenIndex = ownedTokens[_from].length.sub(1); uint256 lastToken = ownedTokens[_from][lastTokenIndex]; ownedTokens[_from][tokenIndex] = lastToken; ownedTokens[_from][lastTokenIndex] = 0; // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping // the lastToken to the first position, and then dropping the element placed in the last position of the list ownedTokens[_from].length--; ownedTokensIndex[_tokenId] = 0; ownedTokensIndex[lastToken] = tokenIndex; } /** * @dev Internal function to mint a new token * Reverts if the given token ID already exists * @param _to address the beneficiary that will own the minted token * @param _tokenId uint256 ID of the token to be minted by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { super._mint(_to, _tokenId); allTokensIndex[_tokenId] = allTokens.length; allTokens.push(_tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @param _owner owner of the token to burn * @param _tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address _owner, uint256 _tokenId) internal { super._burn(_owner, _tokenId); // Reorg all tokens array uint256 tokenIndex = allTokensIndex[_tokenId]; uint256 lastTokenIndex = allTokens.length.sub(1); uint256 lastToken = allTokens[lastTokenIndex]; allTokens[tokenIndex] = lastToken; allTokens[lastTokenIndex] = 0; allTokens.length--; allTokensIndex[_tokenId] = 0; allTokensIndex[lastToken] = tokenIndex; } } interface BitizenCarService { function isBurnedCar(uint256 _carId) external view returns (bool); function getOwnerCars(address _owner) external view returns(uint256[]); function getBurnedCarIdByIndex(uint256 _index) external view returns (uint256); function getCarInfo(uint256 _carId) external view returns(string, uint8, uint8); function createCar(address _owner, string _foundBy, uint8 _type, uint8 _ext) external returns(uint256); function updateCar(uint256 _carId, string _newFoundBy, uint8 _newType, uint8 _ext) external; function burnCar(address _owner, uint256 _carId) external; } contract BitizenCarToken is ERC721ExtendToken { enum CarHandleType{CREATE_CAR, UPDATE_CAR, BURN_CAR} event TransferStateChanged(address indexed _owner, bool _state); event CarHandleEvent(address indexed _owner, uint256 indexed _carId, CarHandleType _type); struct BitizenCar{ string foundBy; // founder name uint8 carType; // car type uint8 ext; // for future } // car id index uint256 internal carIndex = 0; // car id => car mapping (uint256 => BitizenCar) carInfos; // all the burned car id uint256[] internal burnedCars; // check car id => isBurned mapping(uint256 => bool) internal isBurned; // add a switch to handle transfer bool public carTransferState = false; modifier validCar(uint256 _carId) { require(_carId > 0 && _carId <= carIndex, "invalid car"); _; } function changeTransferState(bool _newState) public onlyOwner { if(carTransferState == _newState) return; carTransferState = _newState; emit TransferStateChanged(owner, carTransferState); } function isBurnedCar(uint256 _carId) external view validCar(_carId) returns (bool) { return isBurned[_carId]; } function getBurnedCarCount() external view returns (uint256) { return burnedCars.length; } function getBurnedCarIdByIndex(uint256 _index) external view returns (uint256) { require(_index < burnedCars.length, "out of boundary"); return burnedCars[_index]; } function getCarInfo(uint256 _carId) external view validCar(_carId) returns(string, uint8, uint8) { BitizenCar storage car = carInfos[_carId]; return(car.foundBy, car.carType, car.ext); } function getOwnerCars(address _owner) external view onlyOperator returns(uint256[]) { require(_owner != address(0)); return ownedTokens[_owner]; } function createCar(address _owner, string _foundBy, uint8 _type, uint8 _ext) external onlyOperator returns(uint256) { require(_owner != address(0)); BitizenCar memory car = BitizenCar(_foundBy, _type, _ext); uint256 carId = ++carIndex; carInfos[carId] = car; _mint(_owner, carId); emit CarHandleEvent(_owner, carId, CarHandleType.CREATE_CAR); return carId; } function updateCar(uint256 _carId, string _newFoundBy, uint8 _type, uint8 _ext) external onlyOperator { require(exists(_carId)); BitizenCar storage car = carInfos[_carId]; car.foundBy = _newFoundBy; car.carType = _type; car.ext = _ext; emit CarHandleEvent(_ownerOf(_carId), _carId, CarHandleType.UPDATE_CAR); } function burnCar(address _owner, uint256 _carId) external onlyOperator { burnedCars.push(_carId); isBurned[_carId] = true; _burn(_owner, _carId); emit CarHandleEvent(_owner, _carId, CarHandleType.BURN_CAR); } // override // add transfer condition function _transfer(address _from,address _to,uint256 _tokenId) internal { require(carTransferState == true, "not allown transfer at current time"); super._transfer(_from, _to, _tokenId); } function () public payable { revert(); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Swarm Source
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